JP2001109055A - Camera with data imprint function - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a camera with a data imprinting function capable of knowing whether the cause of poor exposure is due to poor shutter control or poor aperture control. [Configuration] Data imprinting that imprints data on film. L
The CPU 11 includes an ED 19, and determines whether or not the photographing data set by the user or the exposure calculation matches the photographing data measured at the time of exposure. If it is determined that the photographing data coincides, the photographing data measured by the data imprinting LED 19 is determined. Is imprinted on the film, and when it is determined that they do not match, "Err" is imprinted on the data imprinting LED 19 instead of the photographed data measured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera capable of recording photographing data such as a shutter speed and an aperture value on a film.

[0002]

2. Description of the Related Art Conventionally, a large number of cameras having a function of executing a predetermined calculation using the measured luminance of a subject and film sensitivity and performing exposure control based on the obtained appropriate shutter speed and aperture value. Are known. When taking a picture using the automatic exposure function, the exposure control is normally performed according to the calculated values (appropriate shutter speed and aperture value) obtained by the camera through a predetermined calculation, but the exposure control is not performed normally. In some cases, an error occurs between the calculated value and the actual exposure value, resulting in exposure that is not intended by the user. Since this exposure failure occurs very rarely, it is difficult to reproduce the state of the camera body at the time of exposure failure, and it is not possible to determine whether the cause of the exposure failure is due to poor photometry, shutter control, or aperture control failure. It was difficult.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a camera with a data imprinting function capable of knowing whether the cause of exposure failure is due to poor shutter control or aperture control.

[0004]

SUMMARY OF THE INVENTION The present invention comprises: setting means for setting photographing data relating to exposure control; release means for performing exposure processing based on the photographing data set by the setting means; Measuring means for measuring photographing data, and judging means for judging whether or not the value of the actual photographing data measured by the measuring means corresponding to the photographing data set by the setting means and the photographing data matches;
A means for imprinting the actual photographing data measured by the measuring means on the film, and displaying a predetermined error when there is actual photographing data determined by the determining means to be inconsistent with the photographing data set by the setting means. And a data imprinting means for imprinting on a film. According to the above configuration, the user can easily grasp the shooting state (camera body state) at the time of exposure, and determine whether exposure failure has occurred and whether the cause of the exposure failure is due to shutter control failure or aperture control failure. You can know.

[0005] The data imprinting means may be configured to imprint a predetermined error indication on the film instead of imprinting the photographed data when the judging means determines that there is no coincidence. The measuring means preferably includes a memory means for storing the measured actual photographing data, and the data imprinting means reads out all photographing data for one frame of the film from the memory means at the time of winding the film. It is preferable to imprint the data at a predetermined position on the film for each photographing data. The setting means preferably includes an automatic setting means for calculating and automatically setting the photographing data and a manual setting means for manually setting the photographing data, and a user can select a desired one.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a so-called 6 × using a brownie film as an embodiment to which the present invention is applied.
FIG. 4 is a block diagram illustrating an example of a main configuration of a control system of the 4.5 medium format single-lens reflex camera according to an embodiment. The control system mounted on the camera body 10 includes a CPU 11 and a DPU 13 interconnected via a bus line.
The DPU 11 and the DPU 13 have a function as control means for controlling the entire system of the camera body 10.

The DPU 13 is connected to a photometric IC 15, a data imprinting LED 19, a peripheral circuit of the DC / DC converter 21, and a lens CPU 51 mounted on the photographing lens L. It controls the lens CPU 51. Photometric IC1
5 is a DPU 1 for converting an electric signal photoelectrically converted according to the amount of received light into a DPU 1
3 and is input to the CPU 11 as a photometric signal (subject brightness Bv). The CPU 11 performs a predetermined exposure calculation (AE calculation) based on the subject brightness Bv, the film sensitivity Sv, and the like.
To obtain an appropriate exposure value Ev, and obtain an appropriate shutter speed T
v and the aperture value Av are obtained. Further, in the present embodiment, the number of pulses (hereinafter referred to as “E”) output by the aperture control photo-interrupter 29 in conjunction with the aperture operation of the aperture mechanism (not shown).
E-pulse number) is also calculated. In the present embodiment, the photometric IC 15 includes a so-called divided photometric sensor, and can divide a shooting range into a plurality of areas and perform divided photometry for each photometric area.

The data imprinting LED 19 is a light emitting element for imprinting data on a predetermined area of the film.
Illuminates via the DPU 13 under the control of Table 11.
reference). In the present embodiment, the data imprinting LED 19
Although not shown in detail, seven are arranged in a straight line, and alphanumeric characters and symbols represented by 7 × 5 dots are printed on the film. In the vicinity of the data imprinting LED 19, an imprinting optical system (not shown) for guiding the luminous flux data emitted from the data imprinting LED 19 to a predetermined imprinting section is provided so as to cover the data imprinting LED 19. And the imprinting optical system is the data imprinting LE
It has a reflecting surface that makes the dot arrangement formed at the imprint position by the data light beam emitted from D19 an appropriate direction. Therefore, the data beam emitted from the data imprinting LED 19 is imprinted from the back surface of the film via the imprinting optical system. In this embodiment, the data imprinting LED 19 is used to set the Av at the time of exposure.
Data (aperture value) and Tv data (shutter speed) are captured on the film, and the appropriate shutter speed Tv and aperture value Av obtained by the AE operation match the measured shutter speed and aperture value. If not,
"Err" is imprinted in place of the unmatched data value. The data items and the number of items to be printed on the film are arbitrary. This data imprint LED 19,
The CPU 11 and the DPU 13 constitute a data imprinting unit.

The DC / DC converter 21 is a DPU 13
When a power control signal output from the CPU 11 is input via the DPU 13, a data imprinting LED 19, a film feed control photo interrupter 27, and an aperture control photo interrupter 29 are connected.
And so on.

The DPU 13 communicates with the lens CPU 51 mounted on the photographing lens L via a group of electrical contacts provided on the mount surface. In the lens CPU 51,
Lens information unique to the shooting lens, such as focal length information, open aperture value, and minimum aperture value information, is stored, and these lens information is read into the DPU 13 by communication. The DPU 13 transmits the lens information read in the communication with the lens CPU 51 to the CPU 11 through communication executed with the CPU 11.

The CPU 11 has a built-in ROM in which programs related to the functions of the camera are written, and a RAM in which various parameters, lens information, and the like are temporarily stored. The CPU 11 inputs the lens information of the photographing lens L via the DPU 13 and the subject brightness Bv detected by the photometric IC 15, and outputs the data imprint LED 19 via the DPU 13.
Is turned on based on predetermined table data. CPU
Reference numeral 11 has a function as a setting unit, a judgment unit, a measurement unit, a release unit, a data imprinting unit, or a part thereof, in addition to a control unit that comprehensively controls the entire system of the camera body 10.

The CPU 11 is connected to an EEPROM 23, a motor driver 24, a film feed control photo interrupter 27, and an aperture control photo interrupter 29. The EEPROM 23 functions as a memory unit for storing various data relating to photographing, and the data is read out by the CPU 11 in a timely manner. The film feed control photo-interrupter 27 generates a pulse in conjunction with a roller (not shown) that is rotated and driven by the running of the film. The CPU 11 counts the number of pulses generated by the film feed control photointerrupter 27, and detects that the film has been fed by one frame when the count value reaches a predetermined value, that is, detects completion of winding. The aperture control photo-interrupter 29 operates in response to a stop-down operation of a stop-down mechanism (not shown) for stopping down the stop of the taking lens L.
Outputs E pulse. The CPU 11 detects and counts this EE pulse, and when the count value reaches the number of EE pulses obtained by the AE calculation, the stop locking magnet E
EMg is energized to stop the aperture operation of the aperture mechanism, and the aperture value of the taking lens L is kept at the appropriate aperture value Av.

The main motor 25 includes a motor driver 24
Is connected to the CPU 11 via the. Main motor 2
Reference numeral 5 has a function as a film feed motor and a function as a mechanical charge motor, and feeds the film (winding and winding).
The recharging is performed in parallel with rewinding. The mechanical charge is to move (charge) to the initial position against a spring force for moving each of the front curtain and the rear curtain of the shutter, move a mirror (not shown) to the initial position (charge), and raise the mirror. This means moving (charging) the aperture lever of the aperture stop mechanism that stops down the aperture to the initial position against the spring force. Each of the above members is locked at a charging position by mechanical locking means (not shown).

The CPU 11 is connected with a stop lock magnet EEMg, a front curtain magnet 31, a rear curtain magnet 33, a release magnet 35, and a film magnet 36 as magnets. Aperture stop magnet E
EMg stops the narrowing-down operation of the narrowing-down mechanism when the power is supplied, and holds the aperture at a predetermined aperture value. The front curtain magnet 31 and the rear curtain magnet 33 are energized at the time of release processing, lock the front curtain and the rear curtain respectively by electromagnetic force, and release the magnetic locking of the front curtain and the rear curtain when the power is cut off. The traveling is controlled by driving the vehicle. The release magnet 35 is energized after the front curtain magnet 31 and the rear curtain magnet 33 are energized, and releases the mechanical locking of the front curtain and the rear curtain. The film magnet 36 stops running of the film when energized.

The CPU 11 includes, as switches, a photometric switch SWS and a release switch SWR, a main switch SWM, a front curtain running completion detection switch SWX, a rear curtain running completion detection switch SWY, a data imprint permission switch SWD, and a shutter curtain winding completion. Detection switch SWE
Is connected. As is well known, the photometric switch SWS and the release switch SWR are interlocked with the shutter button 39, and the photometric switch SWS is turned on by half-pressing the shutter button 39, and the release switch SWR is turned on by full press.
The main switch SWM is a switch interlocked with the main switch lever 37. When the main switch lever 37 is turned on and turned on, the power supply to the peripheral circuit is started via the DPU 13 and a process corresponding to each switch operation is executed. I do. The first-curtain running completion detection switch SWX is provided at the first-curtain running completion position, and is turned on when the first-curtain running is completed. The rear curtain running completion detection switch SWY is provided at the rear curtain running completion position, and is turned on when the rear curtain running is completed. The data imprinting permission switch SWD is a switch for permitting imprinting of data on the film when turned on by the user. The shutter curtain winding completion detection switch SWE is a switch that turns off when the completion of winding of the shutter curtain is detected.

The main structure of the control system of the camera body 10 has been described above. The camera body 10 detects the focus state of the subject and automatically adjusts the focus. Known components such as a strobe device for emitting light, a DX code input circuit for inputting a DX code to detect a film sensitivity Sv, and the like, an external and an in-viewfinder LCD for displaying various information, and the like are provided.

Based on the above configuration, the camera body 10
The outline of the release process and the data imprinting process will be described. The shutter release button 39 is half-pressed and the photometric switch S
When WS is turned on, the camera body 10 (CPU 11) performs a photometric process, performs an AE calculation based on the subject brightness Bv and the film sensitivity Sv input via the photometric IC 15, obtains an appropriate exposure value Ev, and obtains an appropriate shutter value. Speed Tv
And the aperture value Av, and the number of EE pulses corresponding to the appropriate aperture value Av is further determined. And shutter button 3
When 9 is fully pressed and the release switch SWR is turned on, the CPU 11 starts release processing.

First, the CPU 11 operates the front curtain magnet 31.
Then, power is supplied to the rear curtain magnet 33 to lock the front curtain and the rear curtain by electromagnetic force, and power is supplied to the release magnet 35 to release the mechanical locking of the front curtain and the rear curtain. Next, the mirror (not shown) is raised through the main motor 25, the aperture of the taking lens L is stopped down, the check of the EE pulse output from the aperture control photointerrupter 29 is started, and every time the EE pulse is detected. Is incremented by one. When the count value of the EE pulse reaches the number of EE pulses obtained by the AE calculation, the stop locking magnet EE
The current is supplied to Mg, the stop-down operation of the stop-down mechanism (not shown) is stopped, and the mirror-up operation is completed. When the mirror up is completed, the check of the EE pulse is stopped, the aperture value corresponding to the count value at the time of stop is stored in the EEPROM 23 as Av data, and the number of EE pulses obtained by the AE calculation and the count value at the time of the count stop are calculated. Check for a match. If they do not match, the CPU 11 detects that exposure failure has occurred due to aperture control failure.

Then, the power to the front curtain magnet 31 is cut off, the front curtain runs, and the running check timer is started. When the appropriate shutter speed Tv elapses, the power to the rear curtain magnet 33 is cut off. To run. Upon detecting the completion of the rear curtain driving, the CPU 11 stops the driving check timer and sets the timer time to Tv.
The data is stored in the EEPROM 23 as data, and it is checked whether the timer time matches the appropriate shutter speed Tv obtained by the AE calculation. If they do not match, the CPU 11 detects that exposure failure has occurred due to shutter control failure. Then, the mirror is lowered via the main motor 25 and the film is wound up by one frame. At the time of this winding operation, the CPU 11 detects the film pulse of the film feed control photo-interrupter 27 and sends the A to the data imprint LED 19 via the DPU 13.
The v · Tv data is imprinted on a predetermined area of the film.

FIG. 2 shows an example of photographing data which is imprinted on a predetermined area of the film by the data imprinting LED 19. When the exposure is performed according to the appropriate shutter speed Tv and the aperture value Av obtained by the AE calculation, FIG.
As shown in (A), each data value of Tv data (shutter speed) and Av data (aperture value) is imprinted on a predetermined area of the film from the left. When the shutter speed and the aperture value at the time of exposure (Av / Tv data stored in the EEPROM 23) do not match the proper shutter speed Tv and the aperture value Av obtained by the AE calculation, that is, when the CPU 11 detects an exposure failure, the present embodiment is executed. FIG. 2 (B), (C)
As shown in (2), "Err" is imprinted on an area where improper photographing data is imprinted, instead of the data value. Therefore,
The user is advised that the shooting conditions at the time of exposure,
Further, it is possible to know whether the cause of the exposure failure is due to a stop control failure or a shutter control failure.

Next, the main operation of the camera body 10 will be described in more detail with reference to the flowcharts shown in FIGS. These flowcharts are processes controlled by the CPU 11 by a program written in the built-in ROM.

FIG. 3 shows the main processing of the camera body 10 when a battery (not shown) is loaded. When a battery is loaded, the CPU 11 initializes peripheral circuits connected to each input / output port (S1).
1) Initialize each input / output port, built-in RAM, etc. (S
13), power supply to peripheral circuits is cut off (S15).

"Main switch SWM OFF loop"
The on / off state of each switch is input to check whether the main switch SWM is on (S1).
7, S19). When the main switch SWM is off (S19; N), the interruption of the 250 ms (millisecond) timer is permitted, the 250 ms timer is set, and the apparatus shifts to the standby state (sleep state) and waits until 250 ms elapses. After the elapse of 250 ms, the standby state is released and activated (S21 to S25). Main switch S
While the WM is off, the above processing of S17 to S25 is repeated. The 250 ms timer is a timer for setting a period for periodically checking whether the main switch SWM is turned on.

"PH OFF loop" main switch S
When the WM is turned on (S19; Y), the CPU 11 cuts off the power supply to the peripheral circuit again (S27). Then, the on / off state of each switch is input, and it is checked whether the main switch SWM is on. If the main switch SWM is off, the process returns to S15 (S29,
S31; N). If the main switch SWM is ON, the interruption of the photometric switch SWS is permitted and the
The interruption of the s timer is permitted, the 250 ms timer is set, and the state shifts to the standby state (sleep state) (S
31; Y, S33, S35, S37). Then, it is checked whether or not the photometering switch SWS has been interrupted. If an interrupt has been detected, the process proceeds to S43, in which power supply to peripheral circuits is started, a photometric 10-second timer is started, and a PH ON loop process is started ( S39; Y, S4
3, S45). If there is no interruption of the photometry switch SWS, the control waits until the 250 ms timer elapses, and when it elapses, starts and returns to S29 (S39; N, S41, S
29).

"PH ON Loop" When entering the PH ON loop, first, the on / off state of each switch is checked to determine whether the main switch SWM is on (S47, S49). If the main switch SWM is not turned on, the process returns to S15, in which power supply to peripheral circuits is cut off and the main switch SWM OFF loop processing is executed (S49; N, S15). When the main switch SWM is ON, a photometric process is performed, an AE calculation (automatic exposure calculation) is performed based on the obtained subject luminance Bv, film sensitivity Sv, and the like, and an appropriate exposure value Ev
, And an appropriate shutter speed Tv and an appropriate aperture value Av are obtained (S49; Y, S51, S53). In the AE calculation process, the number of EE pulses corresponding to the appropriate aperture value Av is also calculated. In the following description, the proper shutter speed Tv, the proper aperture value Av, the proper exposure value Ev, and the number of EE pulses obtained by the AE calculation are simply referred to as “calculated values”.

Then, a 125 ms timer is started, and the interruption of the release switch SWR is permitted.
If the 5 ms timer has elapsed, the process returns to S47, and PH
Execute ON loop processing (S55, S57, S59;
Y, S47). The 125 ms timer is used for photometric processing and AE
This is a timer for setting a cycle for executing the arithmetic processing. 12
If the 5 ms timer has not elapsed, it is checked whether or not the photometric timer time has elapsed. If the photometric timer time has elapsed, the process returns to step S27, in which power supply to peripheral circuits is interrupted and the PH OFF loop process is executed. (S59; N,
S61, S27). However, if the photometric timer is set to 2 seconds and the camera enters the PH ON loop in S69, the process returns to S27 if the timer time has elapsed 2 seconds. If the metering timer has not elapsed, the release switch SWR
It is checked whether or not an interrupt has occurred. If no interrupt has occurred, the flow returns to step S59, and a release command wait state is set until the 125 ms timer or the photometry timer elapses (S61; N, S63; N, S59). If there is a release interrupt, the release process and the winding process are executed, the photometric 2 second timer is started, and the process returns to S47.
Execute the PH ON loop processing (S63; Y, S6)
5, S67, S69, S47).

The release process executed in S65 will be described in more detail with reference to the flowchart shown in FIG. In this process, first, the first curtain magnet 31 and the second curtain magnet 33 are energized, the first curtain and the second curtain are locked by the electromagnetic force at the initial position, and the release magnet 35 is energized to release the mechanical lock. (S101). Next, a final photometric process is performed to obtain a more accurate photometric value, the AE calculation is re-executed based on the obtained subject brightness Bv, the film sensitivity Sv, and the like, and a final appropriate exposure value Ev is obtained. An appropriate shutter speed Tv, an appropriate aperture value Av, the number of EE pulses corresponding to the appropriate aperture value Av, and the like are obtained (S10).
3, S105). Then, the mirror (not shown) is raised, and the drive of the main motor 25 is started via the motor driver 24 in order to narrow the aperture of the photographing lens L, and the appropriate aperture value Av obtained by the AE calculation matches the open aperture value. Check whether to perform (S107, S
109).

If the proper aperture value Av matches the open aperture value, it is not necessary to stop down the aperture, so the flow advances to S123 to energize the aperture locking magnet EEMg, hold the aperture at the open aperture value, and execute S125 and subsequent steps. Execute the process (S10
9; Y, S123). When the appropriate aperture value Av is other than the open aperture value, the EE pulse generated by the aperture control photointerrupter 29 is started in conjunction with the aperture operation of the aperture mechanism (not shown), and the aperture interlock timer is started ( S109; N, S111, S113). The aperture interlock timer is a timer that sets the maximum time for the aperture mechanism to narrow down the aperture. Unless the aperture interlocking timer time has elapsed, each time an EE pulse is output from the aperture control photointerrupter 29, +1 is added to the number of EE pulses and stored, and the number of EE pulses reaches the calculated value obtained by the AE calculation. The above-described processes of S115 to S121 are repeated (S115; N, S117; Y, S119, S121;
N).

If it is checked in step S115 that the aperture interlocking timer has elapsed, the Av error flag is set because the number of EE pulses has not reached the calculated value, and the flow proceeds to step S125.
The subsequent processing is executed (S115; Y, S124). A
When the v error flag is set, “Err” is imprinted on a predetermined area of the film instead of imprinting the aperture value (Av data) at the time of winding processing described later.

When the number of EE pulses reaches the calculated value, the aperture stop magnet EEMg is energized to stop the aperture stop operation of the aperture stop mechanism.
It is checked whether the EE pulse is output from step 9 (S121; Y, S123, S125). After the energization of the aperture locking magnet EEMg, normally, no EE pulse is output from the aperture control photo-interrupter 29, so that S127 is skipped and the process proceeds to S129 (S12).
5; N). After some abnormality occurs, the aperture control photo interrupter 2 is turned on after energizing the aperture locking magnet EEMg.
If the EE pulse is output from No. 9, since the aperture has been narrowed down from the appropriate aperture value Av, the Av error flag is set, and the process proceeds to S129 (S125; Y,
S127).

In S129, it is checked whether or not the mirror-up has been completed. If the mirror-up has not been completed, the process returns to S125, and the process returns to S125 until the mirror-up has been completed.
The processing of 125 to S129 is repeated, and the check of the EE pulse is continued (S129; N, S125). When the mirror up is completed, the main motor 25 is stopped, the check of the EE pulse is stopped, the aperture value corresponding to the EE pulse number at this point is stored in the EEPROM 23 as Av data, and the process proceeds to S137 (S129; Y, S131,
S133).

In S137, the energization of the front curtain magnet 31 is stopped, and the running of the front curtain is started (S137). Next, the counting of the appropriate shutter speed Tv time is started (S139). The hard shutter counter for the high shutter speed counts up the shutter speed time from 0 as time elapses, and the counter for the low shutter speed increases by 1
Count down by one every 5.6 ms (milliseconds).
Then, the rear curtain running check timer is started, and it is checked whether the appropriate shutter speed Tv time is faster than 1/60 s (second) (S141, S143). The rear curtain running check timer is a timer that detects the time from the start of traveling of the front curtain to the completion of traveling of the rear curtain.

"When the proper shutter speed Tv is fast" AE
If the calculated proper shutter speed Tv is faster than 1/60 s, it is next checked whether or not the rear curtain running completion switch SWY is turned on. Is locked by the electromagnetic force, the trailing-curtain running completion switch SWY is not normally turned on. Therefore, the process skips S147 and proceeds to S149 (S143; Y, S145; N). When the rear curtain running completion switch SWY is on, it is considered that some abnormality has occurred and the rear curtain has run, and it is considered that the front curtain and the rear curtain did not run at the appropriate shutter speed Tv. At this point, the trailing-curtain running check timer is stopped, the timer time is stored in the EEPROM 23 as Tv data (shutter speed), and the process proceeds to S149 (S14).
5; Y, S147).

In S149, it is checked whether the appropriate shutter speed Tv has elapsed, that is, whether the hard counter value has reached the appropriate shutter speed Tv. If the appropriate shutter speed Tv has not elapsed (S14).
9; N), the process returns to S145, and the processes of S145 to S149 are repeated until the appropriate shutter speed Tv time elapses.
If the appropriate shutter speed Tv has elapsed, the process proceeds to S167.
Then, the energization of the rear curtain magnet 33 is stopped, the rear curtain starts running, the rear curtain check 10 ms timer is started, and it is checked whether the rear curtain travel completion switch SWY is turned on (S149; Y, S167, S1
69, S171). The rear curtain check 10 ms timer is the longest time for waiting for the rear curtain to complete running, and is a timer that stops the rear curtain running check timer after 10 ms has elapsed even if the rear curtain has not completed running.

When the trailing-curtain running completion switch SWY is off, it is checked whether or not the 10 ms timer for trailing curtain check has elapsed.
The process returns to 171 (S171; N, S173; N). When the trailing-curtain running completion switch SWY is turned on or when the trailing-curtain check 10 ms timer elapses, the trailing-curtain traveling timer is stopped and the timer time is stored (S17).
1; Y or S173; Y, S175). That is, when the trailing-curtain running completion switch SWY is turned on or when the trailing-curtain check 10 ms timer has elapsed, whichever is earlier, the trailing-curtain traveling timer is stopped and the Tv data is stored in the EEPROM.
23.

Then, it is checked whether or not the time of the rear curtain running check timer and the time of the appropriate shutter speed Tv are substantially equal (S177). When the rear curtain check timer time and the appropriate shutter speed Tv are substantially equal, exposure is performed at the appropriate shutter speed Tv obtained by the AE calculation, and the process returns (S177; Y). If the rear curtain check timer time is not equal to the appropriate shutter speed Tv time, the shutter control has not been performed normally, so a Tv error flag is set and the process returns (S177; N,
S179). When the Tv error flag is set, “Err” is imprinted on a predetermined area of the film instead of imprinting the Tv data value in a winding process described later.

"When the proper shutter speed is slow" The proper shutter speed Tv time obtained by the AE calculation is 1/60 s (second)
If it is slower, wait until the first-curtain travel completion switch SWX is turned on, that is, until the first-curtain travel is completed, and check whether the second-curtain travel completion switch SWY is turned on (S143; N, S151, S153). ). Normally, the rear curtain running completion switch SWY is not turned on by the energization of the rear curtain magnet 33, so that S155 is skipped and the process waits for 15.6 ms for time adjustment (S153;
N, S157). When the trailing curtain run completion switch SWY is ON, it is considered that some abnormality has occurred and the trailing curtain travel has been completed. Therefore, the trailing curtain travel check timer is stopped. It is stored in the EEPROM 23 as Tv data and waits for 15.6 ms for time adjustment (S153; Y, S1
55, S157).

After waiting for 15.6 ms, it is checked whether the valve mode is set (S15).
9). If the valve mode is not set, the counter is decremented by 1, and it is checked whether the proper shutter speed Tv has elapsed, that is, whether the counter value is 0 (S
159; N, S163, S165). In the present embodiment, the appropriate shutter speed Tv is set as a multiple of 1/60, the appropriate shutter speed Tv is set in a counter, and the counter value is incremented every time 15.6 ms (exactly 1/64 s) elapses. One has been subtracted. If the counter value is not 0, the process returns to S153, and the processes of S153 to S165 are repeated. If the counter value becomes 0 (S165;
Y), and proceed to S167. When the valve mode is set (S159; Y), the processes of S153 to S161 are repeated until the shutter button 39 is released, that is, until the photometric switch SWS and the release switch SWR are turned off (S161; N). When the SWS and the release switch SWR are turned off, the process proceeds to S167 (S
161; Y). The processing after S167 is as already described in the description of “when the appropriate shutter speed Tv is fast”.

The hoisting process executed in S67 will be described in more detail with reference to the flowchart shown in FIG. The winding process is a process of winding the film by one frame after the end of the release process and of imprinting the photographing data on a predetermined area of the film, and is executed in conjunction with the mechanical charging process. Note that the mechanical charging process is a diaphragm lever that moves (charges) to an initial position, moves a mirror to an initial position (charges), and narrows the diaphragm against a spring force that causes the front curtain and rear curtain of the shutter to travel, respectively. Is a process of moving (charging) to the initial position against the spring force.

In this process, first, the transfer counter and the film pulse counter are initialized, and the data transfer time is set (S201, S203). The data imprint time is a time for turning on the data imprint LED 19, and is set based on the film sensitivity Sv.

Next, an imprint data setting process is executed (S205). The details of the imprinting data setting process will be described later, but in the release process (S65), the EEPROM 23 is used.
This is a process of converting the Av data (aperture value) and Tv data (shutter speed) written into the data into actual imprinting data. The data for imprinting is data for determining the arrangement (order) of the data to be imprinted on the film. And DP
Communication is performed with the U13, and the set imprinting data is set in the DPU 13 (S207). The CPU 11
In the data imprinting process described later, the lighting of the data imprinting LED 19 is controlled via the DPU 13 based on the imprinting data set in S205.

"Wind loop processing" S201 to S20
When the initial settings up to 7 have been completed, the main motor 25 is driven via the motor driver 24 to enter the wind loop processing (S209). When entering the wind loop processing,
First, start a 250 μs (microsecond) timer,
It is checked whether two seconds have elapsed since the main motor 25 was driven (S211 and S213). 250μ
The s timer is a timer for setting a cycle for performing the data imprinting process. When two seconds have elapsed since the main motor 25 was driven, that is, when film winding and data imprinting were not completed within two seconds, it is considered that some abnormality occurred, so the main motor 25 was stopped. Then, a winding NG process for notifying that the winding process has not been normally performed on an external LCD or the like (not shown) is executed (S213; Y, S215, S217).

Normally, since 2 seconds have not elapsed since the main motor 25 was driven, it is next checked by the film pulse counter whether there is any remaining film (S213; N, S219). If there is no remaining film, it is checked whether the mechanical charging has been completed (S219; N, S221). When the mechanical charging is completed, there is no need to wind the film, so the main motor 25 is stopped and the process returns (S221;
Y, S223). If the mechanical charging has not been completed, a time loop process is started (S221; N). If there is a remaining film, a chattering process for removing noise of the film pulse output from the film feed control photointerrupter 27 is executed, and whether the rising or falling of the film pulse (hereinafter referred to as “edge”) is detected. (S219; Y, S225,
S227).

When the edge of the film pulse is not detected (S227; N), the time loop processing is started, and when the edge of the film pulse is detected (S227;
Y), 1 is added to the film pulse counter, and it is checked whether or not 48 edges of the film pulse have been detected (S229, S231). In the present embodiment,
The number of film pulses output from the film feed control photointerrupter 27 when winding one frame of film is 24 pulses.

When the film counter value reaches 48, the winding of the film has been completed, so it is checked from the film pulse counter whether or not the current photographing frame is the last frame. (Winding) and returning (S231; Y, S233; Y,
S235). If the current frame is not the last frame,
When the film magnet 36 is energized to stop the running of the film, and when the shutter curtain winding completion detection switch SWE is turned off, the main motor 25 is stopped, the film pulse counter is incremented by 1, and the process returns (S233; N, S2).
37, S239; Y, S241, S243). When the film pulse counter value has not reached 48, a time loop process is started (S231; N).

[Time Loop Processing] In the time loop processing, first, the data printing permission switch SWD is turned on and off.
It is checked whether data imprinting is permitted by turning off the data. If the data imprinting is not permitted, there is no need to imprint data, so the process returns to the wind loop processing after the elapse of the 250 μs timer to complete the film winding (S24).
5; N, S255; Y). If data imprinting is permitted, the value of the imprint item counter is checked (S245; Y, S247). In this embodiment, since two items of the Av data and the Tv data are printed on the film, when the value of the transferred item counter has reached 2, the wind loop processing is performed without any operation after the elapse of the 250 μs timer. (S247; Y, S255; Y).
When the imprint item counter has not reached 2, imprint start standby processing is executed (S247; N, S24).
9).

The imprint start standby process executed in S249 sets an imprint start delay time timer for delaying imprint start in order to execute imprint from a desired position, starts the imprint start delay time timer, This is a process of waiting until the printing start delay time has elapsed. The printing start delay time is set based on the reference delay time / reference pulse time / film pulse time. The reference delay time is an imprint start delay time determined so that imprinting starts from a predetermined position at an arbitrarily determined reference running speed of the film, and the reference pulse time is a film pulse HIGH at the same reference running speed. The film pulse time is the pulse width when the measured film pulse is at the HIGH level. The reference delay time and the reference pulse time are stored in the EEPROM 23 in advance, and the rewriting start position can be easily changed by rewriting the stored numerical value of the reference delay time.

When the imprint start delay time has elapsed, data imprint processing is executed, and 1 is added to the imprint item counter (S251, S253). In the data imprinting process, based on the data imprinting time and the imprinting data set in S203 to S207, the data imprinting LED 19 is turned on via the DPU 13 to imprint the data. In the present embodiment, the imprinting is performed. When the counter value of the item counter is 0, Av data is printed, and when the counter value is 1, Tv data is printed.
After the elapse of the 250 μ timer, the process returns to the wind loop processing (S255). In this embodiment, during 48 counts of the film pulse edge (winding of the film by one frame), this time loop processing is repeated, and Av data (aperture value) and Tv data (shutter speed) are printed.

The imprint data setting processing executed in S203 will be described in more detail with reference to the flowchart shown in FIG. The imprint data setting process is a process of converting each photographing data written in the EEPROM 23 in the release process (S65) into actual imprint data, and determining an arrangement for turning on the data imprint LED 19. Table 1 shows a reference table of the data imprinting LED 19.

[Table 1] Since the data imprinting LED 19 irradiates the film with alphanumeric characters and symbols corresponding to the imprinted data value as light flux data, for example, when imprinting “F1.4”,
The data for imprinting is set to {10, 1, 11, 4, 19}.

In the present embodiment, there are two items of photographic data to be imprinted on the film: Av data (aperture value) and Tv data (shutter speed). Hereinafter, the imprint data setting process of the Av data will be described. To
In this process, an arrangement for lighting the data imprinting LED 19 is determined so that the Av data written in the EEPROM 23 in S132 is imprinted on the film.

In this process, first, it is checked whether the Av error flag is set (S30).
1). In the release process (S67), when the aperture value cannot be reduced to the appropriate aperture value within the aperture interlocking timer time, when the EE pulse is generated even after the aperture locking magnet EEMg is energized, the aperture value at the time of shooting is AE. If the calculated aperture value does not match the proper aperture value, the Av error flag is set, and the Av imprint data Av_MAT is set to $ 1.
9, 16, 20, 20, 19} (S301;
Y, S303).

When the Av error flag is not set, the Av data number Av_No. (S301; N, S305). Av_No. = (AvD-4C (H)) ÷ 8 In the above equation, AvD is stored in the EEPROM 23 in S132.
Is a value obtained by converting the Av data written in the hexadecimal number, and (H) means that the data is expressed in hexadecimal number.
When C (H) is expressed in decimal notation, it is 76.

Then, the obtained Av_No. Based on Av
It sets the data Av_MAT for imprinting and returns (S
307-S347). The above Av table data (Av
Data Av_No. * AvD, etc.) are shown in Table 2.

[Table 2]

The above is the description of the process of setting the imprint data of the Av data. The process of setting the imprint data of the Tv data is also executed in the same manner as described above, and the data imprinting LED is set.
A combination and an arrangement for lighting 19 are determined. Table 3 shows T
The relationship between the v data and the arrangement for lighting the data imprinting LED 19 is shown in a list table.

[Table 3]

As described above, in the present embodiment, the shutter speed and the aperture value measured at the time of exposure are printed on the film, so that the user can know the state of the camera body 10 at the time of exposure and set by the AE calculation. If the appropriate shutter speed Tv and aperture value Av do not match the measured shutter speed and aperture value, "Er" is used instead of the unmatched data value.
Since "r" is printed on the film, the user can know that the exposure failure has occurred and whether the cause of the exposure failure is due to the aperture control failure or the shutter control failure.

In the present embodiment, the Av data (aperture value) and the Tv data (shutter speed) are printed. However, the data items and the number of items to be printed are variable. It is also possible to adopt a configuration in which both of the set imaging data are printed, or a configuration in which the set imaging data and an error between the set imaging data and the measured imaging data are copied. Further, in the present embodiment, the configuration is such that the photographing data measured every time one frame of the film is wound is imprinted, but the measured data may be simultaneously imprinted upon rewinding.

In the above description, the case where the automatic exposure control mode in which the CPU 11 executes the AE calculation and automatically sets the shutter speed and the aperture value has been selected has been described. It is needless to say that the present invention can be applied even when the manual exposure control mode for setting the shutter speed and the aperture value is selected.

[0058]

According to the present invention, the data imprinting means for imprinting the photographing data measured at the time of exposure on the film by the measuring means, and whether or not the photographing data set by the setting means and the photographing data measured by the measuring means match. If the judgment means judges that the data does not match, the data imprinting means imprints "Err" on the film instead of imprinting the measured value of the inconsistent photographing data. In addition, the photographing state (camera body state) at the time of exposure can be easily grasped, and it is possible to know that exposure failure has occurred and whether the cause of the exposure failure is due to shutter control failure or aperture control failure.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an embodiment of a main configuration of a control system of a single-lens reflex camera to which the present invention is applied.

FIG. 2 is a diagram illustrating an example of photographing data captured by a single-lens reflex camera on a predetermined area of a film.

FIG. 3 is a diagram showing, in a flowchart, main processing of the same-lens reflex camera.

FIG. 4 is a flowchart illustrating a release process of the same-lens reflex camera.

FIG. 5 is a view showing a flowchart of a winding process of the same-lens reflex camera.

FIG. 6 is a flowchart showing an Av data setting process of the same-lens reflex camera.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Camera body 11 CPU 13 DPU 15 Photometry IC 19 Data imprinting LED 23 EEPROM 25 Main motor 27 Film feed control photo interrupter 29 Aperture control photo interrupter 31 Aperture locking magnet 33 Front curtain magnet 35 Rear curtain magnet

Claims (7)

[Claims] A setting unit for setting photographing data relating to exposure control; a release unit for performing an exposure process based on the photographing data set by the setting unit; and measuring actual photographing data at the time of the exposure process by the release unit. Measuring means for determining whether or not the photographing data set by the setting means matches the value of actual photographing data measured by the measuring means corresponding to the photographing data; and the measuring means measures the film. Means for imprinting the actual photographing data obtained by the photographing means, wherein when there is actual photographing data which is judged by the judging means to be inconsistent with the photographing data set by the setting means, data imprinting a predetermined error display on the film. And a data imprinting function. 2. The data imprinting means, when there is actual photographing data judged by the judging means not to match the photographing data set by the setting means, a predetermined error instead of imprinting the photographing data. 2. The camera with a data imprinting function according to claim 1, wherein the display is imprinted on a film. 3. The measuring means includes a memory means for storing measured photographing data, and the data imprinting means reads out all photographing data for one frame of the film from the memory means at the time of winding the film, and 3. The camera according to claim 1, wherein the data is imprinted on a predetermined position of the film for each data. 4. The photographing data is an aperture value, wherein the setting means sets an aperture value to be controlled by the release means at the time of exposure processing, and the measuring means sets an actual aperture value at the time of exposure processing. The camera with a data imprinting function according to any one of claims 1 to 3, wherein an aperture value controlled in accordance with (1) is measured. 5. The photographing data is a shutter speed, the setting means sets a shutter speed to be controlled by the release means at the time of exposure processing, and the measuring means sets an actual shutter speed at the time of exposure processing. The camera with a data imprinting function according to any one of claims 1 to 3, wherein the controlled shutter speed is measured. 6. The apparatus according to claim 1, wherein said setting means includes an automatic setting means for calculating and automatically setting said photographing data, and a manual setting means for manually setting said photographing data. Item 6. A camera with a data imprinting function according to any one of Items 1 to 5. 7. The camera according to claim 3, wherein said memory means is a nonvolatile storage element.